Method of and Means for Preventing the Ignition of Coal Dust in Mines during Blasting Operations.

摘要

24,742. Brightmore, J. Oct. 28. Blasting-cartridges.-Consists of a flame-quenching composition, for use in blasting, containing equal proportions of calcareous clay and native carbonate of lime or other limestone, reduced to a powder, and used dry or in a moist semi-plastic condition.